Lesson video

Comparing two sets by finding the difference.

Hello everybody.

I'm Miss Sidhu, we are going to produce some wonderful math today.

Now in this lesson, all of you will be comparing two sets of objects and finding out the difference between them both.

Now, you might need to get some pasta to compare.

Now, let's get started.

Welcome to today's lesson.

And today we will be comparing sets of objects, finding the difference between two sets, an independent task, and an end of lesson quiz to see everything that we have learned.

In today's lesson, you will need a pencil and paper and some pasta pieces to compare.

If you haven't got pasta, you might have some other objects.

Now to warm up our brains first, let's begin this lesson by going over our number bonds to 20.

Now, I want you to make a list of all the equations that make 20.

I want you to pause the video.

Have a think which ones are the number bonds to 20, and then write them down.

To pause, think, and then write them down.

How did you do? Here are all the equations that equal to 20.

10 plus 10.

12 plus eight.

20 plus zero.

Nine plus 11.

16 plus four and 19 plus one.

And the other equations, do not equal to 20.

I hope you've got the same as mine.

If you didn't, then you can just go back and check them again.

Now I think we're ready for today's lesson.

Here we have two children.

One is eight years old, and the other is five years old.

How old are you? Can you show it out? So the girl is eight years old, and the boy is five years old.

How can we represent their ages? What manipulatives or objects shall we use to show how old they are? Hmm, let's have a think.

How about some pasta? Let's give it a go all together.

Okay.

Let's have a look at the girl's age first.

She said her age is eight.

Can you show me eight on your fingers after three? One, two, three.

See, we all showed eight.

Now, let's see if we can represent her age.

How many piece of pasta do we need? So we need eight.

Let's count with me.

So one, two, three, four, five, six, seven, eight.

Great.

Now let's do the boys age.

He said he was, how old was he again? That's right.

Five.

Everyone give me a high five.

Now, so how many piece of pasta do we need to represent his age? Five.

Perfect.

Let's count five.

One, two, three, four, five.

Super.

Thanks for helping me to count.

Now, let's see if we can use all of this information.

We have to find out the difference between the girl and the boy's age.

We can see what's the same.

Now let's see if we can find out the difference.

From there, we can see how many are different.

There is a difference of one, two, three.

Which means the girl is three years older than the boy.

So the difference is three.

Here we have some juicy apples and some fresh bananas.

How can we tell how many bananas there are? What could we do to make it easier to count them? Have a think.

What could we do? Can you shout it out? I listened to lots of your ideas, and I thought lining them up neatly was the best way to find out how many bananas there are.

So here's what I did.

Well, they're now much easier to count.

Now, can you tell me how many bananas there are? Wow.

I heard so many of you tell me that there are eight bananas.

Good counting everyone.

If there are eight bananas and we can see that there are fewer bananas than apples, how many more apples are there? So let's find the difference.

How many more apples are there? When I say go, I want you to shout out the answer.

Ready, steady, go.

Super.

There are three more apples than bananas.

Great work.

Here we have some cakes and sandwiches.

Are there more cakes or sandwiches? What could we do to make it easier to count them? After three, shout out your thoughts.

What could we do to make it easier to count them? That's right.

We can put them nice and neatly into a line.

So, here I've done that with the cakes and the sandwiches.

What I want you to do is I want you to pause the video and find out how many more sandwiches there are compared to cakes.

So are there more cakes or sandwiches? And how many more sandwiches are there than cakes? So you need to find the difference.

How did you get on? So there are more sandwiches than cakes.

And how many more sandwiches are there? Let's count.

One, two.

The difference is two.

Now you're ready for your independent task today.

I want you to compare the butterflies with the flowers, and you can draw the pictures like we did in a nice, neat line and find out how many more or fewer butterflies or flowers there are.

And then write the difference underneath.

Then I want you to compare the birds and the bees.

Find out if there's more or fewer birds than bees and also to find out the difference.

I want you to pause the video to complete your task and resume once you're finished.

Here's the answers.

There are two fewer butterflies than flowers.

There are two more flowers than butterflies.

The difference between the number of flowers and butterflies is two.

There are four more birds than bees, and there were four fewer bees than birds.

The difference between the number of birds and bees is four.

I'd like you to share your work with Oak National.

Please ask your parent or carer to share your work on Twitter, Instagram, or Facebook, tagging @OakNational and #LearnwithOak.

Now, I want you to complete the quiz to see everything that you have learned today because you have done an amazing job at comparing the sets of objects.

Well done everybody.

And now the lesson is over already.

So that's bye.